#include <fstream>
using namespace std;

ifstream in ("distante.in");
ofstream out ("distante.out");

int main() {
    int t;
    in >> t;

    while (t --) {
        int n, m, s;
        in >> n >> m >> s;

        int dist[n + 1];
        for (int i = 1; i <= n; i ++) {
            in >> dist[i];
        }

        if (dist[s] != 0) {
            out << "NU\n";
            continue;
        }

        bool pp = true;
        for (int j = 0; j < m; j ++) {
            int a, b, c;
            in >> a >> b >> c;
            if (dist[a] + c < dist[b] || dist[b] + c < dist[a]) {
                pp = false;
            }
        }

        if (pp) {
            out << "DA\n";
        } else {
            out << "NU\n";
        }
    }

    return 0;
}